Premium
Microstructured Al‐fiber@meso‐Al 2 O 3 @Fe‐Mn‐K Fischer–Tropsch catalyst for lower olefins
Author(s) -
Han Lupeng,
Wang Chunzheng,
Zhao Guofeng,
Liu Ye,
Lu Yong
Publication year - 2016
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.15061
Subject(s) - catalysis , calcination , fiber , fischer–tropsch process , mesoporous material , carbonization , materials science , yield (engineering) , selectivity , composite number , mass transfer , chemical engineering , chemistry , adsorption , composite material , organic chemistry , chromatography , engineering
A thin‐sheet Al‐fiber@meso‐Al 2 O 3 @Fe‐Mn‐K catalyst is developed for the mass/heat‐transfer limited Fischer–Tropsch synthesis to lower olefins (FTO), delivering a high iron time yield of 206.9 µmol COg Fe − 1s −1 at 90% CO conversion with 40% selectivity to C 2 ‐C 4 olefins under optimal reaction conditions (350°C, 4.0 MPa, 10,000 mL/(g·h)). A microfibrous structure consisting of 10 vol % 60‐µm Al‐fiber and 90 vol % voidage undergoes a steam‐only‐oxidation and calcination to create 0.6 µm mesoporous γ‐Al 2 O 3 shell along with the Al‐fiber core. Active components of Fe and Mn as well as additives (K, Mg, or Zr) are then placed into the pore surface of γ‐Al 2 O 3 shell of the Al‐fiber@meso‐Al 2 O 3 composite by incipient wetness impregnation method. Neither Mg‐modified nor Zr‐modified structured catalyst yields better FTO results than K‐modified one, because of their lower reducibility, poorer carbonization property, and fewer basicity. The favorable heat/mass‐transfer characteristics of this new approach are also discussed. © 2015 American Institute of Chemical Engineers AIChE J , 62: 742–752, 2016